
.flex {
    display: flex;
}
.flex1 {
    flex: 1;
}

.flex-start {
    display: flex;
    justify-content: flex-start;
    align-items: center;
}

.flex-end {
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.active {
    background: blue;
}